A looks more correct to me. Not 100% sure tho.Hi!
What exactly You mean?
Place 510p to ground, place 510p to ground adding resistor...
A? B? C?
View attachment 29278
(schematic is only for illustration)
It is there. Higher noise/distortion masks it to some extent in S2.
I see that Jussi of HQPlayer has shared some measurements.
The IMD hump is reduced when the S2 DAC is fed DSD512.
https://audiophilestyle.com/forums/...easonable-cost/?do=findComment&comment=971583
However the DSD 512 in the audible band is worse with clear 8kHz packet noise and 16kHz.
DSD512 is showing no useful benefit. -
I'm failing to see a reduced imd hump in his measurements in that post. All I see is increased spuria in the audible band with dsd512You haven’t commented on the reduced IMD hump and Jussi himself already comments on the USB packet noise (-140dB).
Are you saying IMD hump is a non-issue?
I'm failing to see a reduced imd hump in his measurements in that post.
What this plot shows is that the audible band, below 20kHz is incredibly clean.
I didn't miss anything. What's your point?In the post he says: “You can see the 1 kHz difference product jumps a little at -40 dBFS input level.”
and if you missed it:
“With DSD512 input due to higher data rate you can start seeing the USB packet ticking at 8 and multiples (16 kHz, 32 kHz, etc) at -140 dB level. That packet ticking part is exactly same for768k PCM input, but the IMD hump is back.”
I am looking at all the plots in the post you linked to.One plot alone isn’t enough to show any kind hump (the topic of this thread) though, is it?
Are you saying IMD hump is a non-issue with this DAC?
I didn't miss anything. What's your point?
?In reply to your comment “I'm failing to see a reduced imd hump in his measurements in that post.”
In the post he says: “You can see the 1 kHz difference product jumps a little at -40 dBFS input level.”
and if you missed it:
“With DSD512 input due to higher data rate you can start seeing the USB packet ticking at 8 and multiples (16 kHz, 32 kHz, etc) at -140 dB level. That packet ticking part is exactly same for768k PCM input, but the IMD hump is back.”
There is an utterly miniscule difference in the 1kHz product.
No, what I am saying is that this particular data doesn't really show us what you think it's showing.So this IMD hump thing is a non-issue?
The hump is at inaudible levels? With this DAC anyway?
Also the S2 DAC may well have good suppression of the hump problem. I would have to check.
Seems no one realized this.... It's not smpte imd......Try 60hz + 1khz or 60hz + 7k. My test signal is 60hz + 1khz 4:1 amplitude.I see that Jussi of HQPlayer has shared some measurements.
The IMD hump is reduced when the S2 DAC is fed DSD512.
https://audiophilestyle.com/forums/...easonable-cost/?do=findComment&comment=971583